HC-22 WiFi serial communication module User Manual V1.0

Transcription

1 HC-22 WiFi serial communication module User Manual V1.0 Description: HC-22 is the Department of Science and Technology launched a new order of the fourth generation of embedded Simple -WiFi module products. Simple -WiFi UART interface is based on compliance with WiFi wireless networking standard embedded modules,built-in wireless networking protocol IEEE protocol stack and TCP / IP protocol stack, enables users to convert serial data between the wireless network. Through UART-WiFi module, the traditional serial devices can easily access the wireless network. High-performance wireless module selection ESP8266 SOC, is a complete and self-contained WIFI network solutions that can run independently, can also be mounted as a Slave run on other Host. ESP8266 when the device is mounted as the only application and an application processor, can be started directly from the external flash memory. Built-in cache memory will help improve system performance and reduce memory requirements. Another is, wireless Internet access WiFi adapter undertake the task, you can add it to any microcontroller-based design, the connection is simple, simply by SPI / SDIO interface or central processor AHB bridge interface can be. Processing and storage capacity on ESP8266 powerful piece, it can be integrated via the GPIO port sensors and other applications specific equipment to achieve the lowest pre-development and operation occupy minimal system resources. ESP8266 highly integrated within the chip, including the antenna switch balun and power management converter, so with minimal external circuitry, and the entire solution, including the front-end module, including in the design of the PCB occupied space to a minimum. The system is equipped with ESP8266 manifested leading features are: energy VoIP quickly switch between the sleep / wake pattern, with low-power operation of an adaptive radio bias, front-end signal processing functions, troubleshooting and radio systems coexist characteristics of eliminate cellular / Bluetooth / DDR / LVDS / LCD interference.

2 Features: Interface. default stamp holes 26 PIN interface, reserved for a single strip pin connection Mouth pad holes (the default is not welded pins).. Supports baud rate range: bps. Support ADC detection, built-in high-precision 10 bit ADC. Supports read and set GPIO. single 3.3V power supply, use no small 300mA DC power supply. power-off leakage current of less than 10μA Wireless. supports IEEE802.11b / g / n wireless standard. supports two types of wireless networks: Basic network (Infra) and ad hoc network (Ad-hoc). support soft AP, STA supports up to four connections. support multiple security authentication mechanisms: OPEN / WEP / WPA-PSK / WPA2-PSK Other. Built-in TCP / IP protocol stack. Built TR switch, BALUN, LNA, power amplifier and Matching network. Built-in PLL, voltage regulators and power management components b mode dBm output power. AT + control instruction set support Applications. Smart appliances, smart home. Medical monitoring, smart toys. Automotive electronics, industrial control. Smart grid, things

3 1. Introduction 1.1 Technical Specifications Table 1-1 Product Specifications 项目 参数 Wireless parameters Wireless Standard IEEE b/g/n Frequency Range GHz GHz Antenna Interface On-board PCB antenna Transmit power b: 20 dbm(typical) g: 17 dbm(typical) n: 14 dbm(typical) Receiver sensitivity 02.11b: 91 11Mbps(Typical) g: 75 54Mbps(Typical) n: 72 MCS7(Typical) Hardware parameters Interface Type Standard 3.3V TTL level UART interface, GPIO Interface data rate 110bps bps Operating Voltage 3.3±0.3 V Working current 80mA(Typical average current) Working humidity 5% 90%(Non-condensing) Storage temperature Working temperature Dimensions 26.9mm 13mm Software parameters Network mode STA/softAP/softAP+STA Safety standard WEP / WPA PSK / WPA2 PSK Encryption type WEP64 / WEP128 / TKIP / CCMP(AES) Serial commands Network protocol AT + instruction set TCP/UDP/ARP/ICMP/DHCP/DNS/HTTP /IGMP/PPPOE 1.2 Hardware Introduction Module Size Hc-22 module size is shown below:

4 图 1 1 模块尺寸图 External Interface HC-22 module interface as shown below: 图 1 2 模块接口图 This product provides a schematic diagram shown in Figure 1-2 Interface 26-pin stamp holes and 4-pin single in-line pin (the default is not welding pin) interface,pin Function Definition, As shown in Table 1-2:

5 Table 1-2 External Interface Module Pin number Function Direction Explanation 1 UART_TX O UART data output, 3.3V level; when the power down is prohibited. 2 UART_RX I UART data input, 3.3V level. 3 GPIO15 I/O Universal input and output, internal module connected with pull-down resistors, electrical work on the module; The feet high, the module power does not work. 4 GPIO13 I/O General Purpose Input Output 5 ADC I AD input voltage range is between 0V to 1.024V, the corresponding values are , 10 accuracy. 6 CH_PD I Module enable input, the default pull the module to work; then low, Close WIFI chip inside the module, the current is very small (less than 10 μa). 7 GPIO16 I/O General Purpose Input / Output 8 GPIO14 I/O General Purpose Input / Output 9 GPIO12 I/O General Purpose Input / Output 11 NRST I Module hardware reset input (active low) 12 VCC I Power, 3.3 ± 0.3 V 13 GND I Earthing 14 GND I Earthing 15 GPIO2 I/O General-purpose input / output; internal pull, turn on the power to prohibit the hardware pulldown. 16 GPIO4 I/O General Purpose Input / Output 17 GPIO0 I/O General-purpose input / output; float mode, drop down to the firmware download mode. 18 GPIO5 I/O General Purpose Input / Output 23 GPIO4 I/O General Purpose Input / Output 26 GPIO5 I/O General Purpose Input / Output 27 VCC I Power, 3.3 ± 0.3 V 28 GND 28 GND I Earthing 29 UART_RX I UART data input, 3.3V level. 30 UART_TX O UART data output, 3.3V level; when the power down is prohibited NC

6 1.2.3 Product Design Guidelines HC-22 module in use for product design and layout when the need to note the following: 1 Please use 3.3 ± 0.3 V power supply to the module, power supply output current capacity can not be less than 300 ma, 500 ma or more is recommended. Other Near the outer, power modules please add capacity not less than 100 μ F decoupling capacitor, the capacitor should be as close to the module power supply pin. 2 all the entire layer PCB antennas below do not copper or the power level to ensure that all PCB layers are headroom. In addition, Strongly recommended that the entire PCB antenna extends beyond the floor, and the product can not use a metal shell. 1.3 parameter settings The module supports a variety of parameters, are now on the way to describe the various parameters serial port (AT command mode) using a PC serial port settings assistant to configure the module through the serial port. 1. Start the PC serial port assistant. 2. The UART port WiFi module through the level converter chip (for example, such as MAX3232 or CH340 USB to TTL chips), connected to the computer's COM port or USB port. 3. Select the corresponding COM port, baud rate is configured correctly, as shown below: 图 1 3 串口助手设置图

7 4. The wireless router where your wireless network (AP) setting parameters Modify the wireless settings of parameters (including the network name, Encryption, keys, etc.) and network settings in the IP address of the relevant parameters SmartConfig mode This module provides customers with a convenient wireless configuration, as long as you have a WiFi terminal device, you can by this method Module parameter configuration, the module only key operation can be. Note: After the firmware only supports this function! 1.4 Use Precautions Module power supply is 3.3V, using 3.3V TTL level interface signal default, if you use a 5V system, the interface signal must be level conversion. Module maximum power consumption of about 200mA, the user should pay attention to the choice of power supply power module. User when the electrical connection is preferable to consider the NRST pin module is connected to the user's CPU, when the user needs to prepare the module is reset. Module start time takes roughly one second of time, customers need to pay attention to the system design. 2. Functional Description 2.1 Network Topology WiFi wireless network topology consists of two forms: basic network (Infra) and ad hoc network (Ad-hoc), to explain the wireless network topology, first understand the two basic concepts: AP: namely, wireless access point, is an end to create a wireless network, as well as the central node of the network. Wireless router to use our family or company is an AP, other wireless terminals can be connected to each other through the AP. STA: i.e. the radio stations, a wireless network terminal. Such as laptops, mobile phones and other wireless Internet devices ad hoc wireless network (Ad-hoc) MANET (Ad-hoc) only by two or more wireless network structure consisting of STA, STA network can communicate directly. Note: HC-22 modules can be used as an access to the AP STA, and can also be used as an access AP for the STA. However, as the AP, only support data communications between the STA and AP, does not support direct data communication between the STA and STA. As shown in Figure 2-1. 图 2 1 自组无线网络拓扑图

8 2.1.2 underlying wireless network (Infra) Base network (Infra) is created by the AP, a number of STA joins the wireless network structure thereof. This type of network is characterized by AP as a whole, the center of the network, all data communications network to forward all done by AP. As shown in Figure 2-2. 图 2 2 基础无线网络拓扑图 2.2 Security Mechanism The module supports multiple wireless network encryption, can fully guarantee the secure transmission of user data, including: WEP64 WEP128 WPA-PSK WPA2-PSK 2.3 fast networking The module supports for fast networking by specifying the way the channel number as STA. In the usual course of wireless networking, will first of all the current channel automatically scan to search for networks to be connected AP purpose created. This module provides a set of parameters of the working channel, where the purpose of the network is known in the channel conditions, you can directly specify the working channel module, then you can reduce wireless networking time, so as to achieve the purpose of speeding up network speed. 3. Getting debug module 3.1 Power: verify normal operation of the module can operate in three modes:. 1 STA, 2.AP, 3.AP + STA, factory set to the third Searching on the wireless network power, you can use the WiFi wireless network terminal device search, ESP_XXXXXX visible already in the list (the latter figure is the MAC address after a few). After connecting to the network, view the connection status:

9 Phone search for the network, but also can be connected:

10 3.1.2 test routine ( 一 ) AP mode 1. Establish AP (1) restart module Send the command: AT + RST (instruction execution) Command: AT + RST Response: OK (2) Set the module Send the command: AT + CWMODE = 3 or AT + CWMODE = 2 (setting instruction) Command: AT + CWMODE = <mode> Description: <mode>: 1-Station mode, 2-AP mode, 3-AP and Station mode Response: OK Description: The entry into force (AT + RST) must be restarted 3) configuration parameters AP Send the command: AT + CWS AP = "TEST", " ", 1,3 (instruction set) Command: AT + CWSAP = <ssid>, <pwd>, <chl>, <ecn> Description: The instruction is only valid after the AP mode is on <ssid>: a string parameter, the access point name <pwd>: a string parameter, the password up to 64 bytes, ASCII <chl>: Channel number <ecn>: 0-OPEN, 1-WEP, 2-WPA_PSK, 3-WPA2_PSK, 4-WPA_WPA2_PSK Response: OK Refresh the list of wireless networks, you can see the SSID of the wireless network TEST column in which:

11 Note: At this point will likely connect to the network connection is not the case, please send AT + RST command and wait a few minutes and then connect. (4) View IP access devices After connecting the TEST, send the command: AT + CWLIF (instruction execution) Command: AT + CWLIF Description: View access to IP devices Response: <ip addr> OK Description: <ipaddr>: have access to the IP address If the return command is as follows: Indicates that the network is successfully established, no devices currently connected to. If the wireless network is the actual connection, wait a few minutes and then send the command AT + CWLIF query. (5) check the local IP address Send the command: AT + CIFSR (instruction execution) Command: AT + CIFSR Description: View of the module IP address Note: AP mode is invalid! Will result in the phenomenon of death! Response: <ip addr> Description: <ip addr>: This module IP address But the real test did not occur the phenomenon of death. Check the machine configuration mode: CWMODE = 2, for AP mode. Send the command: AT + CIFSR = (test command), returns the response as follows?: The same phenomenon does not crash.

12 2. Server method Transceiver (0) and the module status inquiry (This step can be omitted) Send command AT + CWMODE? (Check instructions) Command: AT + CWMODE? Description: View WIFI application mode of this module Response: + CWMODE: <mode> OK Description: <mode>: 1-Station mode, 2-AP mode, 3-AP and Station mode Send command AT + CIPMUX? (Check instructions) Command: AT + CIPMUX? Description: Discover this module is to establish multiple connections Response: + CIPMUX: <mode> OK Description: <mode>: 0- single connection mode, 1 multiple connection mode Send command AT + CIPMODE? (Check instructions) Command: AT + CIPMODE? Description: Query transmission mode of this module Response: + CIPMODE: <mode> OK Description: <mode>: 0- nontransparent mode, 1-transparent mode Send command AT + CIPSTO? (Check instructions) Command: AT + CIPSTO? Description: This module queries a server timeout Response: + CIPSTO: <time> OK Description: <time>: server timeout, 0 to 2880, Unit is s

13 (1) Open the multi-connection mode Send the command: AT + CIPMUX = 1 (Set command) Command: AT + CIPMUX = <mode> Description: <mode>: 0- single connection mode, 1 multiple connection mode Response: OK Inquiry found that setting success (2) create a server Send the command: AT + CIPSERVER = 1,8080 (Set command) Command: AT + CIPSERVER = <mode> [, <port>] Description: <mode>: 0- closed server mode, 1 open server mode <port>: port number, the default is 333 Response: OK Description: (1) AT + CIPMUX = 1 时 can turn on the server, server shutdown mode requires restart. (2), open the server is automatically created after listening server, client access when the order will be automatically occupy a connection. Open server service as shown below: Close server service as shown below: Open the USR-TCP232-Test.exe, click the Connect button to connect is not on the server shows that the service is not open.

14 Re-open the server service (Note: need to send it again before the AT + CIPMUX = 1 to re-open the multi-connection mode). Click the Connect button After a successful connection, the serial port module receives the returned data string: Link 180s (Default)), the connection is automatically disconnected, return Unlink, the corresponding button is grayed out clients. The whole process as shown below: (3) Set the server timeout Send the command: AT + CIPSTO = 2880 (setting instructions) Command: AT + CIPSTO = <time> Description: <time>: server timeout, , the unit is s Response: OK

15 (4) establish a client (5) View the current connection Send the command: AT + CIPSTATUS (instruction execution) Command: AT + CIPSTATUS Response: STATUS: <stat> + CIPSTATUS: <id>, <type>, <addr>, <port>, <tetype> OK Description: <id>: id number of the connection 0-4 <type>: string parameter, type TCP or UDP <addr>: a string parameter, IP address <port>: port number <tetype>: 0- do this module client connection, 1 module to do this server connection

16 (6) to send data to a connection Send the command: AT + CIPSEND = 1,6 (Set command) (through a command AT + CIPSTATUS that ID = 1) Instruction: 1) When the single connection (+ CIPMUX = 0), the instruction is: AT + CIPSEND = <length> 2) When multiple connections (+ CIPMUX = 1), the instruction is: AT + CIPSEND = <id>, <length> Response: Upon receipt of this command to return to wrap ">", and then began to receive serial data, send data when the data length of the full length. If you do not establish a connection or the connection is disconnected, returns ERROR If the data is sent successfully, return SEND OK Description: <id>: id number required for transport connection <length>: a numeric parameter, indicating length, maximum length is 80 to send data Please ATE0 close echo command before sending data, or an error occurs Disconnect the client before sending one, get the following response: When sending data length is greater than LENGTH response follows (HELLO once before for data transmission!):

17 At this point the connection is established, you can send and receive data bidirectionally. Sending data to clients using ESP8266 normal. 3. Client method Transceiver (0) Close the server service (if not open server service, may dispense with this step) Send the command: AT + CIPSERVER = 0 (setting instruction) Command: AT + CIPSERVER = <mode> [, <port>] Description: <mode>: 0- closed server mode, 1 open server mode <port>: port number, the default is 333 Response: OK Description: (1) AT + CIPMUX = 1 时 can turn on the server; shutdown mode requires server restart (2), open the server is automatically created after listening server, client access when the order will be automatically occupy a connection. Close server service as shown below (1) Create a server

18 Click Listening, successfully created, the button becomes: (2) On multi-connection mode Send the command: AT + CIPMUX = 1 (Set command) Command: AT + CIPMUX = <mode> Description: <mode>: 0- single connection mode, 1 multiple connection mode Response: OK 3) to establish a TCP connection Send the command: AT + CIPSTART = 2, "TCP", " ", 8080 (setting instructions) Instruction: 1) When the single connection (+ CIPMUX = 0), the instruction is: AT + CIPSTART = <type>, <addr>, <port> 2) When multiple connections (+ CIPMUX = 1), the instruction is: AT + CIPSTART = <id>, <type>, <addr>, <port> Response: If the format is correct and the connection is successful, return OK, otherwise ERROR If a connection already exists, returns ALREADY CONNECT Description: <id>: 0-4, id number of the connection <type>: string parameter indicating the type of connection, "TCP" - established tcp connection, "UDP" - to establish a UDP connection <addr>: a string parameter, the remote server IP address <port>: remote server port number As shown below:

19 (4) sending data to the server Send the command: AT + CIPSEND = 2,8 (Set command) (through a command AT + CIPSTART set to ID = 2) Instruction: 1) When the single connection (+ CIPMUX = 0), the instruction is: AT + CIPSEND = <length> 2) When multiple connections (+ CIPMUX = 1), the instruction is: AT + CIPSEND = <id>, <length> Response: Upon receipt of this command to return to wrap ">", and then began to receive serial data Sending data when the data length full length. If you do not establish a connection or the connection is disconnected, returns ERROR If the data is sent successfully, return SEND OK Description: <id>: id number required for transport connection <length>: a numeric parameter, indicating length, maximum length is 80 to send data Connect

20 Correctly received, more than eight characters are not receiving part. At this point the connection is established, you can send and receive data bidirectionally. Send data to the server using ESP8266 normal. ( 二 ) STA mode 1. Establish STA (1) restart module Send the command: AT + RST (instruction execution) Command: AT + RST Response: OK

21 (2) Set the module Send the command: AT + CWMODE = 3 or AT + CWMODE = 1 (Set command) Command: AT + CWMODE = <mode> Description: <mode>: 1-Station mode, 2-AP mode, 3-AP and Station mode Response: OK Description: The entry into force (AT + RST) must be restarted The module is set to Mode 1, then refresh network list visible network established by ESP8266 disappeared from the list. (3) See the list of current wireless router Send the command: AT + CWLAPs (instruction execution) Command: AT + CWLAP Response: The correct terminal returns :( AP list) + CWLAP: <ecn>, <ssid>, <rssi> OK Error: ERROR

22 Description: <Ecn>: 0-OPEN, 1-WEP, 2-WPA_PSK, 3-WPA2_PSK, 4-WPA_WPA2_PSK <ssid>: a string parameter, the access point name <rssi>: signal strength Such as search no signal, the response: Please re-power and in strict accordance with the AT command and then send it again. When there is no return to the list, please be patient, there would be "busy" 4) Add the current wireless network Send the command: AT + CWJAP = "MERSAIN", "XXXXXXXX" (Set command) Command: AT + CWJAP = <ssid>, <pwd> Description: <ssid>: a string parameter, the access point name <pwd>: a string parameter, password, up to 64 byte ASCII Response: correct: OK Error: ERROR

23 Detecting whether the network really even on the road Send the command: AT + CWJAP (query command)? Command: AT + CWJAP? Response: Returns the currently selected AP + CWJAP: <ssid> OK Description: <ssid>: a string parameter, the access point name Power outages. After power is sent AT + CWJAP?, returns above, the system keeps the last state. View module IP address Send the command: AT + CIFSR (instruction execution) Command: AT + CIFSR Response: correct: + CIFSR: <IP address> OK Error: ERROR Description: <ssid>: a string parameter, the access point name But send AT + CIFSR (View module address), returns ERROR, can use this command to determine there is no real connection. 2. Server method Transceiver (0) and the module status inquiry (This step can be omitted) Send the command: AT + CWMODE (query command)? Command: AT + CWMODE? Description: View WIFI application mode of this module Response: + CWMODE: <mode> OK

24 Description: <mode>: 1-Station mode, 2-AP mode, 3-AP and Station mode Send the command: AT + CIPMUX (query command)? Command: AT + CIPMUX? Description: Discover this module is to establish multiple connections Response: + CIPMUX: <mode> OK Description: <mode>: 0- single connection mode, 1 multiple connection mode Send the command: AT + CIPMODE (query command)? Command: AT + CIPMODE? Description: Query transmission mode of this module Response: + CIPMODE: <mode> OK Description: <mode>: 0- nontransparent mode, 1-transparent mode Send the command: AT + CIPSTO (query command)? Command: AT + CIPSTO? Description: This module queries a server timeout Response: + CIPSTO: <time> OK Description: <time>: server timeout, , the unit is s (1) Open the multi-connection mode Send the command: AT + CIPMUX = 1 (Set command) Command: AT + CIPMUX = <mode> Description: <mode>: 0- single connection mode, 1 multiple connection mode Response: OK

25 Inquiry found that setting success (2) create a server Send the command: AT + CIPSERVER = 1,8080 (Set command) Command: AT + CIPSERVER = <mode> [, <port>] Description: <mode>: 0- closed server mode, 1 open server mode <port>: port number, the default is 333 Response: OK Description: (1) AT + CIPMUX = 1 时 can turn on the server; shutdown mode requires server restart Automatically create server listening (2) Open the server, client access when the order will be automatically occupy a connection. Open server service as shown below: Close server service as shown below: Open the USR-TCP232-Test.exe, click the Connect button to connect is not on the server shows that the service is not open.

26 Re-open the server service (Note: need to send it again before the AT + CIPMUX = 1 to re-open the multi-connection mode). Click the Connect button, as shown. After a successful connection, the serial port module receives the returned data string: Link 180s (default), the connection is automatically disconnected, return Unlink, the corresponding button on the client's grayed out. The whole process as shown below: (3) Set the server timeout Send the command: AT + CIPSTO = 2880 (setting instructions)

27 Command: AT + CIPSTO = <time> Description: <time>: server timeout, , the unit is s Response: OK (4) establish a client Interface settings as shown below: (5) View the current connection Send the command: AT + CIPSTATUS (instruction execution)

28 Command: AT + CIPSTATUS Response: STATUS: <stat> + CIPSTATUS: <id>, <type>, <addr>, <port>, <tetype> OK Description: <id>: id No. 0-4 connections <type>: string parameter, type TCP or UDP <addr>: a string parameter, IP address <port>: port number <tetype>: 0- do this module client connection, 1 module to do this server connection (6) to send data to a connection Send the command: AT + CIPSEND = 0,10 (Set command) (through a command AT + CIPSTATUS that ID = 0) Instruction: 1) When the single connection (+ CIPMUX = 0), the instruction is: AT + CIPSEND = <length> 2) When multiple connections (+ CIPMUX = 1), the instruction is: AT + CIPSEND = <id>, <length> Response: Upon receipt of this command to return to wrap ">", and then began to receive serial data Sending data when the data length full length. If you do not establish a connection or the connection is disconnected, returns ERROR If the data is sent successfully, return SEND OK Description: <id>: id number required for transport connection <length>: a numeric parameter, indicating length, maximum length is 80 to send data Please ATE0 close echo command before sending the data, otherwise it will go wrong. Send:

29 receive: Disconnect the client before sending one, get the following response: At this point the connection is established, you can send and receive data bidirectionally. 3. Client method Transceiver (0) Close the server service (if not open server service, may dispense with this step) Send the command: AT + CIPSERVER = 0 (setting instruction) Command: AT + CIPSERVER = <mode> [, <port>] Description: <mode>: 0- closed server mode, 1 open server mode <port>: port number, the default is 333 Response: OK Description: (1) AT + CIPMUX = 1 时 can turn on the server; shutdown mode requires server restart (2). Server monitor is turned on automatically build server, client access when the order will be automatically occupy a connection. Close server service as shown below:

30 (1) Create a server Click Listening, successfully created, the button becomes: (2) On multi-connection mode Send the command: AT + CIPMUX = 1 (Set command) Command: AT + CIPMUX = <mode> Description: <mode>: 0- single connection mode, 1 multiple connection mode Response: OK (3) to establish a TCP connection Send the command: AT + CIPSTART = 2, "TCP", " ", 8080 (setting instructions) Instruction: 1) When the single connection (+ CIPMUX = 0), the instruction is: AT + CIPSTART = <type>, <addr>, <port> 2) When multiple connections (+ CIPMUX = 1), the instruction is: AT + CIPSTART = <id>, <type>, <addr>, <port> Response: If the format is correct and the connection is successful, return OK, otherwise ERROR

31 If a connection already exists, return ALREAY CONNECT Description: <id>: 0-4, id number of the connection <type>: string parameter indicating the type of connection, "TCP" - established tcp connection, "UDP" - to establish a UDP connection <addr>: a string parameter, the remote server IP address <port>: remote server port number As shown below: (4) sending data to the server Send the command: AT + CIPSEND = 2,10 (Set command) (through a command AT + CIPSTART set to ID = 2) Instruction: 1) When the single connection (+ CIPMUX = 0), the instruction is: AT + CIPSEND = <length> 2) When multiple connections (+ CIPMUX = 1), the instruction is: AT + CIPSEND = <id>, <length> Response: Upon receipt of this command to return to wrap ">", and then began to receive serial data Sending data when the data length full length. If you do not establish a connection or the connection is disconnected, returns ERROR If the data is sent successfully, return SEND OK Description: <id>: id number required for transport connection <length>: a numeric parameter, indicating length, maximum length is 80 to send data Please ATE0 close echo command before sending the data, otherwise it will go wrong.

32 At this point the connection is established, you can send and receive data bidirectionally. 4. Application examples 4.1 wireless remote control application Phone as a station, connected to the softap HC-22 provides, HC-22 can be connected via UART and equipment, wireless control.

33 4.2 remote connectivity applications HC-22 as a station, through the wireless router (AP) connected to the Internet, you can upload data to the cloud server, download the firmware update. Mobile terminals (mobile phones, laptops, etc.) can also cloud server, remote control HC-22 module.